spark KafkaOffsetRangeLimit 源码
spark KafkaOffsetRangeLimit 代码
文件路径：/connector/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaOffsetRangeLimit.scala
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.sql.kafka010
import org.apache.kafka.common.TopicPartition
import org.apache.spark.sql.kafka010.KafkaSourceProvider.StrategyOnNoMatchStartingOffset
/**
* Objects that represent desired offset range limits for starting,
* ending, and specific offsets.
*/
private[kafka010] sealed trait KafkaOffsetRangeLimit
/**
* Represents the desire to bind to the earliest offsets in Kafka
*/
private[kafka010] case object EarliestOffsetRangeLimit extends KafkaOffsetRangeLimit
/**
* Represents the desire to bind to the latest offsets in Kafka
*/
private[kafka010] case object LatestOffsetRangeLimit extends KafkaOffsetRangeLimit
/**
* Represents the desire to bind to specific offsets. A offset == -1 binds to the
* latest offset, and offset == -2 binds to the earliest offset.
*/
private[kafka010] case class SpecificOffsetRangeLimit(
partitionOffsets: Map[TopicPartition, Long]) extends KafkaOffsetRangeLimit
/**
* Represents the desire to bind to earliest offset which timestamp for the offset is equal or
* greater than specific timestamp.
*/
private[kafka010] case class SpecificTimestampRangeLimit(
topicTimestamps: Map[TopicPartition, Long],
strategyOnNoMatchingStartingOffset: StrategyOnNoMatchStartingOffset.Value)
extends KafkaOffsetRangeLimit
/**
* Represents the desire to bind to earliest offset which timestamp for the offset is equal or
* greater than specific timestamp. This applies the timestamp to the all topics/partitions.
*/
private[kafka010] case class GlobalTimestampRangeLimit(
timestamp: Long,
strategyOnNoMatchingStartingOffset: StrategyOnNoMatchStartingOffset.Value)
extends KafkaOffsetRangeLimit
private[kafka010] object KafkaOffsetRangeLimit {
/**
* Used to denote offset range limits that are resolved via Kafka
*/
val LATEST = -1L // indicates resolution to the latest offset
val EARLIEST = -2L // indicates resolution to the earliest offset
}
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